Yes! i gave her an adult sized pillow since before she turned 1. i just thought it was a good idea when she had a runny nose, and then i just kept it bc she seems to like it. it also helps me transition her from breastfeeding with the pillow to just laying her on the bed with a pillow. she sleeps on her stomach as well on the bed, but with the pillow the most she does is sideways or side stomach, but not full stomach sleeping. i don't know if it makes a difference to her sleep, i like to think it helps her sleep better, but who knows.

Sleep and your preschooler
Even when your child throws off the cot and the all-night feeds, sleep challenges in the preschool years can still keep you wondering. Get tips and advice on how to help your 3 to 4 year old get a great sleep.